Last-ehgagikg dog fob last lathes



Sept. 18 1928.

W. H. KAY

LAST ENGAGING DOG FOR LAST LATHES Filed Aug. 31, 1926 Patented Sept. '18, 1928.

UNITED STATES PATENT OFFICE.

WILLIAM H. KAY, 0F LYNN, MASSACHUSETTS.

LAST-ENGAGING DOG FOR LAST LATHES.

Application filed August 31, 1926. Serial No. 132,836.

that the body is coaxial with the spindle, a

spur co-axial with the body and projecting from the outer end thereof, to enter the heel end of'a last, and a pair of centering ears fixed to the body and projecting from the outer end thereof, at one side of the spur,

and adapted to bear on opposite sides of the heel end of the last, between the top thereof and the spur, the arrangement bein such that the median line of the last and its heel end may stand at Various inclinations, while the heel end is engaged with the spur and supported laterally by said ears.

A dog thus characterized is shown by my Patent No. 1,l93,780, dated May 13, 19%, said dog being provided with a rest adjustable on the body and projecting forward therefrom in position to bear on the heel seat portion of the last bottom, so that the last is supported at one side of the spur by the centering ears, and at the opposite side by the rest.

The present invention is an improvement on the dog disclosed by the above-mentioned patent, and has for its object to provide a rigid and compact dog, adapted to engage the last at three points on its heel end, without engaging or hearing on the heel seat portion thereof, so that the last may be adjust ably supported, without the liability of displacement which enists when the dog is, provided, as heretofore, with a rest projecting from its body sufliciently to bear on the heel seat of the last.

Of the accompanying drawings forming a part of this specification,

Figure l is a View showing partly in plan and partly in section, portions of a last lathe nclud ng two of the improved heel-engag 111g dogs hereinafter described.

Figure E2 is a top plan Figure 3 an end View view, and of one of the dogs.

Figure 4 is a section on line 4-4 of Fig.-

ure 2.

Figure 5 is a side View, showing the dog anda portion of the heel end of a last.

Figure 5 is a fragmentary View similar to a portion of Figure 5, showing a different adjustment.

Figure 6 is a perspective View of the slide, constituting a part of the dog shown by the preceding figures.

Figure 7 is-a View similar to Figure 3,

showing a modification.

Figure 8 shows in J constituting a part of Figure 7.

erspective the slide the dog shown by Figure 9 is a section on line 9-9 of Figure 7.

The same reference characters indicate swinging holder of an;

ordinary lathe, the

pattern last bearing on the pattern wheel 16, and the last 15 being acted on by the rotary-cutter head 17.

The heel end of each last is engaged by a dog embodying the invention.

substantially cylindrical body 18, provided at its outer end with a transverse end face 19, and with lastcentering means embodied in a pair of cars 20, projecting from one edge of the end face and having converging edges 21, adapted to bear simultaneously on opposite sides of the heel end portion. of a last, so that longitudinal pressure exerted by the usual adjustable dog 22, constituting a part of the loosely rotating or dead spindle of the lathe, centralizes the heel end by forcing it toward the apex of the notch formed by the edges 21.

The end face 19 is offset inwardly from said. notch to permit various inclinations of the heel end of the last.

From the end face 19 projects a fixed spur 24, which is coaxial with the body 18, and is adapted to enter an indentation previously formed for its reception in the heel end of the last.

hen the last is operatively installed, its toe end is engaged by the loosely rotating dog 22, and its heel end is impaled on the spur 24:, and gripped between the cars of the positively rotated dog 18, so that the last is positively rotated, its heel end being positioned in accordancewith theilocation 'of the, indentation entered by the spur 2a. The last is automatically centered by the converging 1 edges 21, and its longitudinal inclination is determined by the location. of said. Yindenta-i tion.

The body. 18: of ieach dog is provided, with couali'nnv-means ada' oted to be interen 'a 'ed c 7 b a with complemental coupling means on the corresponding live spindle, the coupling means on eaehbody being preferably a socket- 2,into which opensa slotQ'Z, said socket and slot conforming to a correspondingly formed terminal on-the corresponding live spindle, thearrangement being such that the dogibody is coaxialwith the live spindle.

The centeringears 20 are preferably in tegral with the body, are non-adjustable relative thereto, and are located at one side :of the spurQet.v The body 18 is preferably bodied in-a pair'of ear-s 31, formed on the outerend of the slide by a notch 82, therein, as shown by- Figure 6. Said ears project from th'e 'body 18at theopposite side of the spur Qtfrom the fixedears '20 The slide is longitudinally adjustableon thebody 18, tovar-y -the projection'of the ears 31," as shown by Figures 5 and 5 Figure 5 showingia minimum, and Figure 5 a maximum projection of said ears. I provide clamplng means engaging-the body and the slide, and adaptedto confinethe slidein any positionto which it maybeadjusted. In this instance, the clamping means is embodied v in a; bolt:33, inserted in a socket in the body.18,- and provided with a head at and a-nut 35. The head confines a washer 36 againsttheslide 30, and the :nut confines a washer 3'? against the body 18. The inner faces of said-washers are preferably curved, as shownby Figureii. Theisli'de 3O is .pro

videdlwith a slot 38, through which the bolt passes, the slot permitting-any desired adjustment of the slide. The centering ms 81 are so spaced from the spur 2st, that they are adapted to bear wholly on a portion of the heel end face L of the last, and not upon the heel-seat face L thereof.

The arrangement is such that a. last may swing on the spur 24, and its hcel end face L may be siilpported by the two pairs of ears E20 and 31, at various inclinations while engaged with the spur, as indicated by Figures 5 and .5,-the adjustable centering ears 31, cooperating with the spur and with the fixed centcrii earsQO, in en aging the heel end face L of the last at a plurality of points .abouethe heel-seat face L and positively maintaining the last at various inclinations relative to the spur. The convex slide seat formed by a portion of the periphery :of the cylindrical body, and the concave inner face of theslide 30 cooperate in preventing the slide froinlinrning. The slideis therefore prevented from turning on the bolt33. The major portion ofthe slide is rigidlybacked by the body, so that yielding or springing of the centering ears 31'is-prevcnted,. the curvature of the slide ii'nparting rigidity to said ears.

AlthoughT prefer the last described form of the body and'slido, I am not limited thereto. The slidemay be ilat, as shown by Figures 7, 8 and 9,and thebody' lfizmayhe provided :with a flat face or seat 14:0 (Figure 7) on whichithe-flat inner faceof the slide bears. Tn thismodification. the turning of the slideonthe bolt is prevented by an ear ll, pressed outward from theslide,-and a longitudinalagroove 4:2 in. thebody 18,:in which the ear 41 is slidable.

I claim 1. Alast. dog. con'iprising a body having means at oneend whereby it may be con pled to the live spindle of a last lathe, so that the body iscoaxial with the spindle, and providcdat its opposite end with a. Spur-coaxial with the body and formed, to cng'agethc midlcngth portion of the heelend face of a last, and. with lined non-{uh justablecenteringears projecting from the bodyat one side of the spur, and formed to engage the upper end portion of said eudwface, a slidemovable on thcbody in a directionparallel with the axis thereof, and provided with centering ears projecting from the body at the opposite side-of the spur, and spaced therefrom to engage the lower end portion of the heel-cn l face of the last, and means for 'releasably clainping the slide to the body, so that the centering ears of the slide. may project variably ,froin thebody, the arrangement being such that the adjustable centering ears cooperate. with i the spur and the fixed centering ears in on gagingtheheel-end face of. the last at a plurahty of points above theheel-seat face thereof, and positively maintaining the slide seat, and the slide being curved and 10 last at various inclinations relative to the having a transversely concave inner face spur. contacting with the seat, so that the slide 2. A last dog as specified by claim 1, the is confined against turning movements on clamping means being embodied in a bolt the bolt. extending through the body and through a In testimony whereof I have aflixed my 5 longitudinal slot in the slide and having a signature. clamping head and a clamping nut, the body being provided with a transversely convex WILLIAM H. KAY. 

